<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>H5新特性尝试</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .header{
            margin: 0 auto;
            height: 100px;
            width: 400px;
            background-color: skyblue;
        }
        .nav{
            margin: 0 auto;
            height: 100px;
            width: 400px;
            background-color: rebeccapurple;
        }
    </style>
</head>
<body>
<header class="header"></header>
<nav class="nav"></nav>
<article class="article"></article>
<aside class="aside"></aside>
<footer></footer>
</body>
</html>